Dr. Alfred Swaine Taylor (left) and a colleague, performing the Marsh test on samples taken from the body of John Parsons Cook. The two were looking for traces of arsenic and antimony, 1856. Universal Images Group / Getty Images

For centuries people from all walks of life sought to eliminate friends, strangers and enemies using the devious, subtle poison known as arsenic. Arsenic poisoning became such a well-known method of murder that people in Britain began calling it ''inheritance powder''. But what made it so popular? How did this particular substance become the stuff of history? Join Ben and Noel as they delve into the fascinating, morbid story of arsenic.